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I know this is an old thread but as a heads up for anyone experiencing dead battery after leaving their car sitting overnight or couple days I just experienced same problem with my 06 M roadster about 75k on clock.
Shop in VA did countless tests on the electrical system even got a new OEM battery which lasted maybe a week then back to dead after parking for more then 4-6 hours.
I had a thought that I do listen to my iphone music alot while driving so suggested they check the amplifier. Turns out my factory amplifier failed and wasn't turning off when the vehicle was turned off thus the parasitic draw killing the battery. Disconnected the amplifier and now no sound system but no more dead battery 8)
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